String theory deviations from GR in strong field regime

In summary, string theory is a scalar-tensor theory of gravity that includes higher order corrections. The recent discovery of gravitational waves from the merging of two black holes, which match predictions from general relativity (GR) in the strong field regime, begs the question of how much deviation string theory should have from GR in the same regime and whether LIGO can detect it. However, since current gravitational wave generation is based on classical GR, there is no contribution from quantum gravity, making it difficult for string theory to prove itself in this area. Additionally, scalar-tensor theories do not produce different results for gravitational waves compared to GR. Therefore, at this point, the strong field regime cannot determine the validity of string theory.
  • #1
kodama
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string theory is a scalar-tensor theory of gravity, with higher order corrections. in light of the result discovery of gravitational waves of 2 black holes merging, matching GR in the strong field regime, how much deviation should strong theory differ from GR in the strong field regime and can LIGO detect them?

if results continue to match GR in the strong field regime and not match up with string theory, how would this affect string as a theory of QG
 
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  • #2
The usual process to generate gravitational waves is part of classical GRT. Currently there is no contribution of quantum gravity to this part. Therefore sring theory is also not able to produce any contribution to this topic. As far as I know scalar-tensor theories do not produce a different output for gravitational waves then GRT. The higher order corrections (in a sense of an effective theory) have more the effect to prevent the singularity (see also http://arxiv.org/abs/1512.08346).
So currently, the strong field regime cannot decide about the trueness of string theory.
 
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Related to String theory deviations from GR in strong field regime

1. What is the strong field regime in string theory?

The strong field regime in string theory refers to the energy scale at which string effects become important and cannot be ignored. This typically occurs at very high energies or in the presence of extremely dense objects such as black holes.

2. How does string theory deviate from general relativity (GR) in the strong field regime?

In the strong field regime, string theory predicts deviations from the predictions of general relativity. These deviations are due to the fact that string theory takes into account the effects of quantum mechanics, which are not included in GR.

3. Can string theory explain the behavior of matter in strong gravitational fields?

Yes, string theory is able to explain the behavior of matter in strong gravitational fields. It takes into account the effects of quantum mechanics, which allows for a more accurate description of how matter behaves in these extreme conditions.

4. Are there any experimental or observational evidence for string theory deviations from GR in the strong field regime?

Currently, there is no direct experimental or observational evidence for string theory deviations from GR in the strong field regime. However, there are ongoing efforts to try and detect these deviations through experiments and observations of black holes and other extreme objects in the universe.

5. How does string theory account for the existence of singularities in strong gravitational fields?

Unlike general relativity, string theory does not predict singularities in strong gravitational fields. Instead, it suggests that these singularities are actually resolved by the effects of quantum mechanics. This is one of the reasons why string theory is considered a promising candidate for a theory of quantum gravity.

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